This is an experiment to learn about pH and to make your own pH test paper strips using liquid from boiled red cabbage and cut up paper coffee filters. You then test various household liquids to see if they are acidic, neutral or alkaline (basic). We hope your kids enjoy the experiment and develop a life-long interest in the sciences.
Use boiled red cabbage to make your own pH test paper and then check the pH of various common household liquids. Red cabbage gets its color from a chemical called “Anthocyanin.” It is also the pigment that turns leaves red or purple in autumn. Anthocyanin is a good indicator of acids and bases. When added to a base, the purplish pigment turns green or yellow. When added to an acid, it changes to pink or red. In something that is neutral (neither an acid nor a base), the paper will remain the same color (or maybe turn a little blue).